Made of cotton fabric, durable and comfortable. Gentle hand wash to prolong product life. If your baby makes cute cooing noises when you put the knitted hat on your baby, it may be because the soft material feels good on his head. The functional rolled edge design allows you to roll up the brim of the hat to change the size and style of the baby hat, this hat can accompany your baby as they grow. Fold over part of the brim of the hat and cover it so you can adjust it to fit your baby hat. You roll them up, and as the baby grows, you unfold. Keeping your baby's head and ears warm all winter long, these adorable baby boy hats fit perfectly and go with just about every baby outfit and everyday wear. These baby hats are a great gift for a birthday or other important event. Tile cap height: about 20CM Hat circumference: about 18CM. The hat circumference is pulled to about 50CM